A turbojet has a maximum thrust of 10,000 lbs at sea level, Mach 0.3. At an altitude of 25,000 ft at Mach 0.82, the TSFC is 1.0 lb/lb-hr. Using the simple models for Mach number and altitude lapse that we discussed in class, how long (in hours) could the engine operate at maximum thrust at the 30,000 ft, Mach 0.8 condition with a fuel weight of 10,000 lbs available in the tanks?